The existing derivations of conventional fast RLS adaptive filters are intrinsically dependent on the shift structure in the input regression vectors. This structure arises when a tapped-delay line (FIR) filter is used as a modeling filter. In this paper, we show that a more general data structure is induced by other filter implementations, such as Laguerre-based filters and, more importantly, that an exact fast RLS algorithm can still be derived for such Laguerre-induced data structures.One of the benefits of working with a Laguerre basis is that fewer parameters can be used to model long impulse responses.
Nikolaos Geroliminis, Emmanouil Barmpounakis, Georgios Anagnostopoulos
Mathew Magimai Doss, Eklavya Sarkar
Mathew Magimai Doss, Julian David Fritsch